PySide6 This application failed to start because no Qt platform plugin could be initialized. 解决办法

↵问题描述：

qt.qpa.plugin: Could not find the Qt platform plugin "windows" in "D:\professional_software\Anocon
da\Anaconda\Lib\site-packages\PySide6\plugins"
This application failed to start because no Qt platform plugin could be initialized. Reinstalling 
the application may fix this problem.

解决办法：

添加环境变量。

变量名：QT_QPA_PLATFORM_PLUGIN_PATH

变量值就是~\Lib\site-packages\PySide6\plugins\platforms（注意这里要包含platforms，我看到有的的解决方案就是到plugins，我试了不管用，试了许多，终于可以了。）